Loaded Guns, Loaded Kids - What is the root cause of mass shootings?

"The argument has understandably grown heated in this year of so many mass shootings. With December 14’s mass murder at Sandy Hook Elementary committed by a young man diagnosed with autism – a diagnosis by itself not associated with violence – We The People (a group associated with some Constitution Party members) launched a petition on the White House website to demand an investigation of drug company products, stating that between 2004 and 2011, there have been over 11,000 reports to the U.S. FDA’s MedWatch system of psychiatric drug side effects related to violence."